[ToolShed 2.0] Replace Infinite Scrolling GQL with Rest+Pagination

[jmchilton]

All sorts of odd little breaking happens with the infinite scrolling grid and potentially with GQL. This is much more straight-forward now. The paradigm is more familiar and the static nature should make the UI much more robust. This required all sorts of updates to the index endpoint but I caught some bugs and added a bunch of test coverage and generally feel good about all those endpoint updates.

I also removed the recently updated repositories widget. The update times I think are correct from the database - but I have no clue what the database is actually tracking. Maybe each download is an update? Anyway - GQL is now just used for the recently recently created listings now - a pretty small component.

There was a bunch of whitespace on the landing page caused by removing the recently updated repositories. I've replaced this with a little help carousel and some context about what the tool shed is. I reused the help in the actual help page so that is more filled in now also.

Before:

After:

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[jmchilton]

I've implemented some more hardening also. I've refined the changing password story a bit - there is some actual end-user feedback now when things go correctly. I also implemented some simple rate limiting on sensitive APIs using slowapi. We don't monitor these services as closely so I think this is probably important.